PCPP1 Practice Test 7 — 10 Questions

Question 1

What happens when you add two objects of a class that implements __add__?

Accepted Answer

The __add__ method is called.. The __add__ method is automatically called by the interpreter when the '+' operator is used.

Answer

It does nothing.

Answer

It concatenates the objects.

Answer

It raises a TypeError.

Question 2

You are refactoring code that performs sensitive operations. Which of the following is the most secure practice for handling secret keys?

Accepted Answer

Use environment variables to store sensitive configuration.. Hardcoding secrets is a major security vulnerability; using environment variables is the industry standard.

Answer

Encrypt the secrets and store them as constants in a module.

Answer

Store secrets in a private class attribute.

Answer

Hardcode them as strings inside a 'config.py' file and ignore it in Git.

Question 3

You are implementing a custom context manager using a class. Which methods must be implemented to support the 'with' statement?

Accepted Answer

__enter__ and __exit__.. A context manager requires `__enter__` to set up the resource and `__exit__` to handle cleanup.

Answer

__setup__ and __teardown__.

Answer

__open__ and __close__.

Answer

__init__ and __del__.

Question 4

Which THREE features are associated with robust logging in production applications?

Accepted Answer

Log rotation to prevent disk space exhaustion.. Logging levels, rotation, and external log aggregation are standard.

Answer

Logging to 'stdout' exclusively.

Answer

Including personal user data in logs.

Question 5

Why might you use the __init_subclass__ hook instead of a metaclass?

Accepted Answer

It is easier to implement and avoids metaclass conflicts.. __init_subclass__ provides a simpler way to perform logic when a subclass is created, without the complexity and inheritance issues associated with custom metaclasses.

Answer

Metaclasses are deprecated.

Answer

Metaclasses cannot be used for registration.

Answer

It is faster at runtime.

Question 6

Which TWO of the following are correct regarding the 'with' statement in Python?

Accepted Answer

It requires the class to define __enter__ and __exit__.. The 'with' statement handles setup and teardown, and it requires both __enter__ and __exit__.

Answer

It works by implicit __init__ calling.

Answer

It only works with file objects.

Answer

It can be used with any object.

Question 7

Which magic method enables index access (e.g., obj[i])?

Accepted Answer

__getitem__. The __getitem__ method allows an object to support indexing.

Answer

__index__

Answer

__setitem__

Answer

__access__

Question 8

According to PEP 8, what is the maximum recommended length for a line of code?

Accepted Answer

79 characters.. PEP 8 suggests limiting lines to 79 characters to allow multiple files to be opened side-by-side.

Answer

80 characters.

Answer

No limit.

Answer

120 characters.

Question 9

You need a color chooser dialog in your application. Which module contains this functionality?

Accepted Answer

tkinter.colorchooser. The 'tkinter.colorchooser' module provides the askcolor() function.

Answer

tkinter.dialogs

Answer

tkinter.colors

Answer

tkinter.widgets

Question 10

You are building a Tkinter application and need to ensure that a Label widget expands to fill any extra horizontal space when the parent window is resized. Which configuration for the grid() layout manager achieves this?

Accepted Answer

parent.columnconfigure(0, weight=1) and widget.grid(sticky='ew'). The sticky parameter with 'ew' (east and west) ensures the widget stretches horizontally, while columnconfigure with weight > 0 allows the column to expand.

Answer

widget.pack(fill='x', expand=True)

Answer

widget.grid(sticky='nsew')

Answer

widget.grid(padx=10, pady=10)